//
// Created by yamunaku on 2020/11/13.
//

#include <bits/stdc++.h>
//#include <atcoder/all>

using namespace std;
//using namespace atcoder;

#define rep(i, n) for(int i = 0; i < (n); i++)
#define repl(i, l, r) for(int i = (l); i < (r); i++)
#define per(i, n) for(int i = ((n)-1); i >= 0; i--)
#define perl(i, l, r) for(int i = ((r)-1); i >= (l); i--)
#define all(x) (x).begin(),(x).end()
#define MOD9 998244353
#define MOD1 1000000007
#define IINF 1000000000
#define LINF 1000000000000000000
#define SP <<" "<<
#define CYES cout<<"YES"<<endl
#define CNO cout<<"NO"<<endl
#define CFS cin.tie(0);ios::sync_with_stdio(false)
#define CST(x) cout<<fixed<<setprecision(x)

using ll = long long;
using ld = long double;
using vi = vector<int>;
using mti = vector<vector<int>>;
using vl = vector<ll>;
using mtl = vector<vector<ll>>;
using pi = pair<int, int>;
using pl = pair<ll, ll>;
template<typename T>
using heap = priority_queue<T, vector<T>, function<bool(const T, const T)>>;

int main() {
    //CFS;
    int n, m;
    cin >> n >> m;
    vi b(n);
    rep(i, n) {
        cin >> b[i];
        if (i & 1) b[i] = -b[i];
//        cout << b[i] << " ";
    }
//    cout << endl;
    vector<priority_queue<int, vi, greater<int>>> v(n+1);
    vi l(m), r(m);
    rep(i, m) {
        cin >> l[i] >> r[i];
        v[l[i] - 1].push(r[i] - 1);
    }
    vl rui(n+1, 0);
    rep(i, n) {
        if(i > 0) rui[i] += rui[i-1];
        ll k = b[i] - rui[i];
//        cout << i SP k << endl;
        if(v[i].empty()) {
            if(k == 0) continue;
            CNO;
            return 0;
        }
        int rr = v[i].top() + 1;
//        cout << rr << endl;
        rui[i] += k;
        rui[rr] -= k;
        v[i].pop();
        if(v[i].size() < v[rr].size()){
            while(!v[i].empty()){
                v[rr].push(v[i].top());
                v[i].pop();
            }
        }else{
            while(!v[rr].empty()){
                v[i].push(v[rr].top());
                v[rr].pop();
            }
            v[rr] = v[i];
        }
    }
    CYES;
    return 0;
}